correctly report position to xwayland clients

Previously we didn't take into account their borders requiring us to add
`borderpx` to override_redirect clients.

Fixes: https://codeberg.org/dwl/dwl/issues/651

client.h

@@ -350,7 +350,7 @@ client_set_size(Client *c, uint32_t width, uint32_t height)
 #ifdef XWAYLAND
 	if (client_is_x11(c)) {
 		wlr_xwayland_surface_configure(c->surface.xwayland,
-				c->geom.x, c->geom.y, width, height);
+				c->geom.x + c->bw, c->geom.y + c->bw, width, height);
 		return 0;
 	}
 #endif